JPH02126456A - Magnetic tape device - Google Patents

Abstract

PURPOSE:To prevent the occurrence of an error during the read/write time by measuring friction torque of reel motors and preventing a magnetic tape from varying in tension. CONSTITUTION:When an operation mode is instructed by a signal line 12, the supply and take-up reel motors 4 and 5 are rotated by an arithmetic processing circuit 10 via supply and take-up reel driving circuits 8 and 9, respectively. When the motors 4 and 5 are stabilized in rotation at prescribed value, the friction torque of each motor is calculated by the circuit 10 to be stored in a storage circuit 11. Subsequently, under the mode of normal use of the magnetic tape 1, one signal is counted in response to the other reel tachometer signal by the circuit 10 according to the mode instruction by the signal line 12, and tape wound radii of the supply and take-up reels 2 and 3 are evaluated, and the stored friction torque data are read out of the circuit 11, and also supply power to the motors 4 and 5 for obtaining the required tape tension is calculated and sent to the circuits 8 and 9, and then the reels are driven in accordance with a result of processing to obtain the required tape tension. By this method, the occurrence of an error during the time of read/write of data can be prevented due to variations of the contact state between the magnetic tape and a magnetic head.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic tape device, and more particularly to a magnetic tape device for storing digital information used in an information processing device.

(Prior Art) Conventionally, this type of magnetic tape device has a supply reel and a pick-up reel wound with magnetic tape, a supply reel motor and a pick-up reel motor coupled to each reel, and a supply reel motor and a pick-up reel motor coupled to each reel motor. A supply reel tacho and a pick-up reel tacho that output pulses according to the rotation of the motor, a reel motor drive circuit that supplies the desired current to each reel motor, and a pulse signal from each reel tacho are input. It was configured to include an arithmetic processing circuit that calculates the current supplied to each reel motor.

Furthermore, the magnetic tape was configured so that it was directly transferred between each reel without using a buffer or the like.

Among the pulse signals from each reel tough, the arithmetic processing circuit counts the pulse signals of the other according to one pulse signal, and thereby calculates the tape winding radius of each reel.

In order to set the tension of the magnetic tape to a predetermined value, the arithmetic processing circuit calculates the current to be supplied to each reel motor based on the above-mentioned tape winding radius, reel motor torque constant, and Masatsu torque value. . The obtained current value is transmitted to the reel motor drive circuit, and current is supplied to the reel motor to apply tension to the magnetic tape.

The above-mentioned Masatsu torque is calculated as a predetermined value. However, the actual torque of the motor varies widely, and it is difficult to manage it to a constant value during motor manufacturing, and this variation has a non-negligible effect on the tension of the magnetic tape.

(Problem to be solved by the invention) In the above-mentioned conventional magnetic tape device that transfers the tape directly between reels, the actual torque of the reel drive motor varies (just in case the tension of the magnetic tape changes). Additionally, the contact status changes between the magnetic head and the magnetic tape used to read or write data onto the magnetic tape, resulting in errors occurring when reading/writing data. There is a drawback that there are cases.

An object of the present invention is to hold data regarding the torque of the supply reel motor and the pick-up reel motor, detect the rotational speed of the supply reel and the pick-up reel, and input the held data and rotational speed information to reel the motor. It is an object of the present invention to provide a magnetic tape device having a configuration in which the above-mentioned drawbacks are eliminated by creating motor drive data, and no errors occur during reading/writing of data.

(Means for Solving the Problems) A magnetic tape device according to the present invention includes a data holding means, a supply reel rotation speed detection means, a pick-up reel rotation speed detection means, an arithmetic processing means, and a pair of drive circuits. It is constructed as follows.

The data holding means is for holding data regarding the actual torque of the supply reel motor and the pick-up reel motor.

The sub-2 reel rotational speed detection means is the next one that detects the supply reel rotational speed.

The pick-up reel rotational speed detection means is for detecting the rotational speed of the pick-up reel.

The arithmetic processing means inputs nine rotational speed information obtained by the supply reel rotational speed detection means and the pick-up reel rotational speed detection means.

In addition to creating drive data for the supply reel motor and the pick-up reel motor, data regarding the torque of each reel motor is calculated from the current of each reel motor and held in the data holding means, and the held data and the above rotation speed information are calculated. and use to drive each reel motor.

It is used to transport magnetic tape between reels at the desired tension and speed.

The pair of drive circuits are designed to supply current to each reel motor according to the data output from the arithmetic processing means.

(Example) Next, the present invention will be explained with reference to polished surfaces.

1- is a block diagram showing one embodiment of a magnetic tape device according to the present invention.

In Figure 1, 1 is a magnetic tape, 2 is a supply reel, 3 is a pick-up reel, 4 is a supply reel motor, 5 is a take-up reel motor, 6 is a supply reel tacho, 7 is a pick-up reel tacho, 8 is a supply reel Drive circuit, 9 is a pick-up reel drive circuit, 10
1 is an arithmetic processing circuit, and 11 is a storage circuit.

Referring to FIG. 1, the magnetic tape 1 is connected to the supply reel 2.
and is wound around the pick-up reel 3 and directly transferred between each reel.

A supply reel motor 4 and a supply reel tacho 6 are coupled to the supply reel 2, and a pick-up reel motor 5 and a pick-up reel tacho 7 are coupled to the pick-up reel 3.

Each reel tacho 6.7 outputs a pulse signal in accordance with the rotation of the reel, and these outputs are supplied to the arithmetic processing circuit 10. The arithmetic processing circuit 10 is connected to the memory circuit 11. The memory circuit 11 is constituted by a backed-up RAM or the like, and has semi-permanent memory capacity.

The arithmetic processing circuit 10 calculates the current to be supplied to each reel motor 4.5, and sends the current data to the supply reel drive circuit 8,
and output to the pick-up reel drive circuit 9. Each reel drive circuit 8°9 has a respective reel motor 4.5
Supplies specified current to.

The arithmetic processing circuit IO receives an operation mode signal via a signal line 12 from a higher-level control circuit not shown in FIG.

First, the first stage operation mode will be explained.

The first stage operation mode is an operation mode selected during inspection or maintenance of the device.

When the first stage production mode is instructed by the operation mode signal on the signal line 12, the arithmetic processing circuit 10 sends a drive signal to each reel drive circuit 8.9 to drive each reel motor 4.9.
Rotate 5.

At this time, the magnetic tape 1 is not attached to each reel 2.3.

The arithmetic processing circuit 10 receives pulse signals from each reel tacho and increases or decreases current data sent to each reel drive circuit 8.9 so that each reel rotates at a predetermined number of revolutions t. Thereafter, the arithmetic processing circuit 10 calculates the actual torque of each reel motor 4.5 according to the current value of each reel motor 4.5 when the rotation of each reel motor 4.5 is stabilized at a predetermined value. Then, the calculation results are sent to the storage circuit 11 and stored therein.

Next, the second stage operation mode will be explained.

In the second stage operation mode, the magnetic tape 1 is transferred to each reel 2,
This mode is selected during normal use of a magnetic tape device that transfers between 3 and 3 times.

When the second stage operation mode is designated by the operation mode signal on the signal line 12, the arithmetic processing circuit 10 counts the reel tacho signal of one reel tacho signal of the other according to the other reel tacho signal. As a result, the arithmetic processing circuit 10 calculates the tape winding radius of each reel 2.3, and also reads out the torque data of each reel Tanabata 4.5 stored in the first stage operation mode from the storage circuit 11. Then, calculate the current required to be supplied to each reel motor 4.5 to obtain the desired tape tension.

The calculation processing results are sent to each reel drive circuit 8.9, and each reel motor 4.5 is driven according to the processing results to obtain a desired tape tension.

(Effects of the Invention) As explained above, the magnetic tape device of the present invention measures and stores the actual torque of the reel motor.
This has the effect that changes in the tension of the magnetic tape due to variations in the torque of the reel motor can be prevented.

Therefore, it is possible to eliminate errors during data reading/V writing due to changes in the contact state between the magnetic tape and the magnetic head.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a magnetic tape device according to the present invention. l...Magnetic tape 2.3...Reel 4.5.
... Reel motor 6.7 ... Reel tacho, 9 ... Reel drive circuit 0 ... Arithmetic processing circuit 1 ... Memory circuit 2 ... Signal line

Claims (1)

[Claims] Data holding means for holding data regarding the torque of the supply reel motor and the take-up reel motor, supply reel rotation speed detection means for detecting the rotation speed of the supply reel, and detection means for detecting the rotation speed of the take-up reel. a take-up reel rotation speed detection means for controlling the supply reel motor and the take-up reel by inputting rotation speed information obtained by the supply reel rotation speed detection means and the take-up reel rotation speed detection means; While creating drive data for the motor, the data regarding the actual torque of each reel motor is calculated from each reel motor current and held in the data holding means, and the held data and the rotational speed information are used. a calculation processing means for driving each of the reel motors to transfer the magnetic tape between the reels at a desired tension and speed; and supplying current to each of the reel motors according to data output from the calculation processing means. What is claimed is: 1. A magnetic tape device comprising: a pair of drive circuits for controlling the magnetic tape device;